There's some lovely road loops in Dartmoor. I'm usually riding from Exeter, but if you stick to the main roads, aim to loop up to Two Bridges, and then back, and you can have a great ride. MTBing is good too though.

east dartmoor or lustleigh bovey tracey is only 20mins from torquay, it has fantastic riding there.
i ride there thursday evenings and sunday mornings (early on sundays) if you fancy a few hours up there then you could bell me closer to the time.

with all due respect that MBR loop its not the best riding in that area of Dartmoor IMHO. It's a long ride but tends to avoid/miss all the great stuff in & around Hound Tor/Lustleigh Cleeve & in some places goes the wrong way

If you want a more thrilling, techy & IMHO rewarding ride then you could do no worse than ride the loop that foxyrider has linked to.

Trailmonkey/Shinythings put together a loop with all the best bits in the area & made for a superb ride. You might also want to post up on here for a local to help/guide you around Lustleigh I know Yunki lives in the area & maybe free to go for a ride.

Thanks. The map on the garmin site is quite complicated and I dont have a device to download to. I couldnt quite work out which way round it should be ridden. Could you list the main waypoints so I can plot it out on a OS map please? Cheers